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NFC: Take a reference on the LLCP local pointer when creating a socket 

LLCP sockets point to their local LLCP service, so they need to take a
reference on it.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2012-05-04 11:24:16 +02:00
parent f8f5701bda
commit c7aa12252f
3 changed files with 40 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
net/nfc/llcp/llcp.c
View File

@ -59,8 +59,6 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local)
release_sock(sk);
sock_orphan(sk);
s->local = NULL;
}
parent_sk = &parent->sk;
@ -83,8 +81,6 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local)
release_sock(accept_sk);
sock_orphan(accept_sk);
lsk->local = NULL;
}
}
@ -96,13 +92,39 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local)
release_sock(parent_sk);
sock_orphan(parent_sk);
parent->local = NULL;
}
mutex_unlock(&local->socket_lock);
}
struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
{
kref_get(&local->ref);
return local;
}
static void local_release(struct kref *ref)
{
struct nfc_llcp_local *local;
local = container_of(ref, struct nfc_llcp_local, ref);
list_del(&local->list);
nfc_llcp_socket_release(local);
del_timer_sync(&local->link_timer);
skb_queue_purge(&local->tx_queue);
destroy_workqueue(local->tx_wq);
destroy_workqueue(local->rx_wq);
kfree_skb(local->rx_pending);
kfree(local);
}
int nfc_llcp_local_put(struct nfc_llcp_local *local)
{
return kref_put(&local->ref, local_release);
}
static void nfc_llcp_clear_sdp(struct nfc_llcp_local *local)
{
mutex_lock(&local->sdp_lock);
@ -612,7 +634,7 @@ static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
new_sock = nfc_llcp_sock(new_sk);
new_sock->dev = local->dev;
new_sock->local = local;
new_sock->local = nfc_llcp_local_get(local);
new_sock->nfc_protocol = sock->nfc_protocol;
new_sock->ssap = bound_sap;
new_sock->dsap = ssap;
@ -943,6 +965,7 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
local->dev = ndev;
INIT_LIST_HEAD(&local->list);
kref_init(&local->ref);
mutex_init(&local->sdp_lock);
mutex_init(&local->socket_lock);
init_timer(&local->link_timer);
@ -1015,14 +1038,7 @@ void nfc_llcp_unregister_device(struct nfc_dev *dev)
return;
}
list_del(&local->list);
nfc_llcp_socket_release(local);
del_timer_sync(&local->link_timer);
skb_queue_purge(&local->tx_queue);
destroy_workqueue(local->tx_wq);
destroy_workqueue(local->rx_wq);
kfree_skb(local->rx_pending);
kfree(local);
nfc_llcp_local_put(local);
}
int __init nfc_llcp_init(void)

4
net/nfc/llcp/llcp.h
View File

@ -44,6 +44,8 @@ struct nfc_llcp_local {
struct list_head list;
struct nfc_dev *dev;
struct kref ref;
struct mutex sdp_lock;
struct mutex socket_lock;
@ -165,6 +167,8 @@ struct nfc_llcp_sock {
struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
int nfc_llcp_local_put(struct nfc_llcp_local *local);
u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
struct nfc_llcp_sock *sock);
u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local);

14
net/nfc/llcp/sock.c
View File

@ -111,7 +111,7 @@ static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
}
llcp_sock->dev = dev;
llcp_sock->local = local;
llcp_sock->local = nfc_llcp_local_get(local);
llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
llcp_sock->service_name_len = min_t(unsigned int,
llcp_addr.service_name_len,
@ -487,7 +487,7 @@ static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
}
llcp_sock->dev = dev;
llcp_sock->local = local;
llcp_sock->local = nfc_llcp_local_get(local);
llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
if (llcp_sock->ssap == LLCP_SAP_MAX) {
ret = -ENOMEM;
@ -701,8 +701,6 @@ struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
{
struct nfc_llcp_local *local = sock->local;
kfree(sock->service_name);
skb_queue_purge(&sock->tx_queue);
@ -710,13 +708,11 @@ void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
skb_queue_purge(&sock->tx_backlog_queue);
list_del_init(&sock->accept_queue);
if (local != NULL && sock == local->sockets[sock->ssap])
local->sockets[sock->ssap] = NULL;
else
list_del_init(&sock->list);
list_del_init(&sock->list);
sock->parent = NULL;
nfc_llcp_local_put(sock->local);
}
static int llcp_sock_create(struct net *net, struct socket *sock,